Table 5.
Top ten most frequently used keywords.
| Keyword | Occurrences |
|---|---|
| ML | 55 |
| DL | 27 |
| IoT | 22 |
| activity recognition | 17 |
| sensors | 12 |
| HAR | 10 |
| wearable sensors | 10 |
| CNN | 8 |
| classification | 7 |
| context-awareness | 7 |
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